CVE-2026-25736

MEDIUMNVD 4.86.1
EchelonGraph scoreMEDIUM confidence

“▲” beside the score: it is higher than NVD's CVSS score.

Score 6.1 from GitHub Security Advisory (severity: MODERATE) published 2026-02-25. NVD baseline CVSS 4.8; sources differ by 1.3.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this weekElevated

Also known asEUVD-2026-8729 (ENISA EUVD) · GHSA-fq4f-4738-rqxm (GitHub Security Advisories) · PYSEC-2026-3055 (OSV.dev)Source: ENISA EUVD

6.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Versions prior to 35.8.3, 38.5.4, and 39.3.1 have a stored Cross-Site Scripting (XSS) vulnerability in the Custom RSE Attribute of the WebUI where attacker-controlled input is persisted by the backend and later rendered in the WebUI without proper output encoding. This allows arbitrary JavaScript execution in the context of the WebUI for users who view affected pages, potentially enabling session token theft or unauthorized actions. Versions 35.8.3, 38.5.4, and 39.3.1 fix the issue.

CVSS v3
4.8
EG Score
6.1MEDIUMmedium confidence
EG Risk
43
EG Risk 43/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
27th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-31). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 25, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Aug 6, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Stored Cross-Site Scripting (XSS) in Custom RSE Attribute of Rucio WebUI · Advisory · rucio/rucio · GitHub

https://github.com/rucio/rucio/security/advisories/GHSA-fq4f-4738-rqxm
GitHub release Patch Available

Rucio 39.3.1 patch release

Patch available: rucio/rucio 39.3.1

https://github.com/rucio/rucio/releases/tag/39.3.1
GitHub release Patch Available

Rucio 38.5.4 LTS patch release

Patch available: rucio/rucio 38.5.4

https://github.com/rucio/rucio/releases/tag/38.5.4
GitHub release Patch Available

Rucio 35.8.3 LTS patch release

Patch available: rucio/rucio 35.8.3

https://github.com/rucio/rucio/releases/tag/35.8.3
Web page

Cross Site Scripting Prevention - OWASP Cheat Sheet Series

https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
piprucio-webui @ 35.8.3 (fixes < 35.8.3)—ghsa
piprucio-webui @ 38.5.4 (fixes >= 36.0.0rc1, < 38.5.4)—ghsa
piprucio-webui @ 39.3.1 (fixes >= 39.0.0rc1, < 39.3.1)—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
rucio-webui1.10.0 ... 39.3.0 (452 versions)
  • every version up to 35.8.3: fixed in 35.8.3
  • 36.0.0rc1 up to 38.5.4: fixed in 38.5.4
  • 39.0.0rc1 up to 39.3.1: fixed in 39.3.1
—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 10× in last 7d / 39× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 99 of 104 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 1 repeat row among the latest 100 is merged into the row it repeats. The 5 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  2. 2026-11-01 07:57 UTCGHSA enrichmentGHSA-fq4f-4738-rqxm · GitHub severity MODERATE · GitHub CVSS 6.1
  3. 2026-11-01 07:57 UTCEG score recompute▲ 1.30
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  7. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  9. 2026-10-27 09:55 UTCOSV refresh
  10. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  11. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  12. 2026-10-25 14:39 UTCEG score recompute
  13. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  14. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  16. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-18 03:52 UTCEG score recompute
  21. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.5% · 38th percentile
Show 74 more
  1. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  2. 2026-10-12 16:08 UTCEG score recompute
  3. 2026-10-11 20:01 UTCEG score recompute
  4. 2026-10-11 17:14 UTCEG score recompute
  5. 2026-10-11 14:45 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  9. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  10. 2026-10-08 13:35 UTCOSV refresh
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  19. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  20. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  21. 2026-09-24 14:03 UTCEPSS rescoreEPSS 0.5% · 37th percentile
  22. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  24. 2026-09-18 19:20 UTCOSV refresh
  25. 2026-09-16 14:07 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  27. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  28. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  29. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  30. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  31. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  32. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  33. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  34. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  35. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  36. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  37. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  38. 2026-08-30 22:47 UTCOSV refresh
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  40. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  41. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  42. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  43. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  44. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  45. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  46. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  48. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  49. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  53. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  54. 2026-08-14 08:59 UTCEG score recompute
  55. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  56. 2026-08-13 02:03 UTCEG score recompute
  57. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  58. 2026-08-11 23:55 UTCEG score recompute
  59. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  60. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  61. 2026-08-10 13:14 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  63. 2026-08-09 08:37 UTCEG score recompute
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  65. 2026-08-07 20:41 UTCEG score recompute
  66. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  67. 2026-08-06 02:59 UTCEG score recompute
  68. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  69. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  70. 2026-08-04 05:49 UTCEG score recompute
  71. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  72. 2026-08-02 19:32 UTCEG score recompute
  73. 2026-08-02 02:26 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  74. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.3% · 21st percentile

Frequently asked(5)

What is CVE-2026-25736?
CVE-2026-25736 is a medium-severity vulnerability; its CVE record was published on February 25, 2026. Rucio is a software framework that provides functionality to organize, manage, and access large volumes of scientific data using customizable policies. Versions prior to 35.8.3, 38.5.4, and 39.3.1 have a stored Cross-Site Scripting (XSS) vulnerability in the Custom RSE Attribute of the WebUI where…
When was the CVE record for CVE-2026-25736 published?
The CVE record for CVE-2026-25736 was published on February 25, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-25736 actively exploited?
CVE-2026-25736 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-25736?
CVE-2026-25736 has a CVSS v3 base score of 4.8 (NVD). EchelonGraph synthesises NVD + FIRST EPSS + GHSA into a combined EG score of 6.1 (MEDIUM).
How do I remediate CVE-2026-25736?
A fix for CVE-2026-25736 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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