CVE-2026-27639

MEDIUMNVD 5.45.4
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 5.4 under NVD CVSS v3. EPSS exploit probability: 0.3% (25th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-8613 (ENISA EUVD)Source: ENISA EUVD

5.4EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 5.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mercator is an open source web application designed to enable mapping of information systems. A stored Cross-Site Scripting (XSS) vulnerability exists in Mercator prior to version 2026.02.22 due to the use of unescaped Blade directives ({!! !!}) in display templates. An authenticated user with the User role can inject arbitrary JavaScript payloads into fields such as "contact point" when creating or editing entities. The payload is then executed in the browser of any user who views the affected page, including administrators. Version 2026.02.22 fixes the vulnerability.

CVSS v3
5.4
EG Score
5.4MEDIUMmedium confidence
EG Risk
24
EG Risk 24/100

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)
Severity54% × 45%
Impact severity (EG Severity): CVSS 5.4 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (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.
EPSS PROB
0.3%
EPSS %ILE
25th
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 (5.4): severity, escalated by confirmed exploitation. This CVE's 5.4 is its impact severity (EG Severity), not escalated.

EG Severity
5.4 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS. 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 or medium mission impact; Track* at high (mission-essential systems).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 or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (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 (4)

Auto-updated Aug 4, 2026
Patch available. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

Stored XSS via unescaped Blade directives in display templates · Advisory · sourcentis/mercator · GitHub

https://github.com/dbarzin/mercator/security/advisories/GHSA-65p7-pph2-966g
GitHub commit Patch Available

commit c58bb1d2fff1 (dbarzin/mercator)

Patch available: dbarzin/mercator 2026.02.24 (contains commit c58bb1d2fff1)

https://github.com/dbarzin/mercator/commit/c58bb1d2fff18605c61d93cfaf77adca416c560a
GitHub commit Patch Available

commit 9902ffd91f28 (dbarzin/mercator)

Patch available: dbarzin/mercator 2026.02.24 (contains commit 9902ffd91f28)

https://github.com/dbarzin/mercator/commit/9902ffd91f287e474729f514c77261f4ef7db8fe
GitHub commit Patch Available

commit 839d23139994 (dbarzin/mercator)

Patch available: dbarzin/mercator 2026.02.24 (contains commit 839d23139994)

https://github.com/dbarzin/mercator/commit/839d231399944e43a865198262e96e0218252cc3

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× 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 97 of 103 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 6 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:44 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-10-31 00:25 UTCOSV refresh
  5. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-10-25 14:38 UTCEG score recompute
  12. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  14. 2026-10-23 04:24 UTCEG score recompute
  15. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  20. 2026-10-18 03:51 UTCEG score recompute
  21. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  22. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  23. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  24. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  25. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
Show 72 more
  1. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-10-12 16:17 UTCEG score recompute
  3. 2026-10-11 19:59 UTCEG score recompute
  4. 2026-10-11 17:13 UTCEG score recompute
  5. 2026-10-11 14:44 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-10-08 13:35 UTCOSV refresh
  11. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  12. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  22. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  23. 2026-09-18 19:20 UTCOSV refresh
  24. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  26. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  27. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  28. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  29. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  30. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.3% · 20th 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% · 19th percentile
  36. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  37. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  38. 2026-08-30 22:47 UTCOSV refresh
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  40. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  41. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  42. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  43. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  44. 2026-08-25 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  45. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  46. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  47. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  48. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  49. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  51. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  52. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  53. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  54. 2026-08-14 09:03 UTCEG score recompute
  55. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  56. 2026-08-13 02:06 UTCEG score recompute
  57. 2026-08-12 13:50 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  58. 2026-08-12 00:48 UTCEG score recompute
  59. 2026-08-11 13:42 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  60. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  61. 2026-08-10 09:59 UTCEG score recompute
  62. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  63. 2026-08-09 08:41 UTCEG score recompute
  64. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  65. 2026-08-07 20:45 UTCEG score recompute
  66. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  67. 2026-08-06 03:03 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 05:55 UTCEG score recompute
  71. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  72. 2026-08-02 19:36 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-27639?
CVE-2026-27639 is a medium-severity vulnerability; its CVE record was published on February 25, 2026. Mercator is an open source web application designed to enable mapping of information systems. A stored Cross-Site Scripting (XSS) vulnerability exists in Mercator prior to version 2026.02.22 due to the use of unescaped Blade directives ({!! !!}) in display templates. An authenticated user with the…
When was the CVE record for CVE-2026-27639 published?
The CVE record for CVE-2026-27639 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-2026-27639 actively exploited?
CVE-2026-27639 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (25th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-27639?
CVE-2026-27639 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-27639?
A fix for CVE-2026-27639 is available: update to the fixed version the vendor names in its advisory.

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