CVE-2026-40597

HIGHPre-NVD 7.67.6
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this week

Also known asEUVD-2026-31496 (ENISA EUVD) · GHSA-9c3j-xm6v-j7j3 (GitHub Security Advisories)Source: ENISA EUVD

7.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 7.6Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / HTML injection vulnerability, an attacker can bypass the Content Security Policy's script-src directive by uploading a crafted attachment to any issue that, when accessed via the file_download.php link, will be downloaded with a valid JavaScript MIME type resulting in script execution. The uploaded payload must be sniffed as a valid JavaScript MIME type by PHP finfo (see file_create_finfo() API function). Non-JavaScript MIME types will not get imported in a tag by the browser, due to response header X-Content-Type-Options being set to nosniff, which requires all imported JavaScript files to be a valid JavaScript MIME type. This issue has been fixed in version 2.28.2.

CVSS v3
7.6
EG Score
7.6HIGHmedium confidence
EG Risk
34
EG Risk 34/100

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)
Severity76% × 45%
Impact severity (EG Severity): CVSS 7.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 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 every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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
0.5%
EPSS %ILE
42nd
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 (7.6): severity, escalated by confirmed exploitation. This CVE's 7.6 is its impact severity (EG Severity), not escalated.

EG Severity
7.6 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% 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 every mission impact level.CISA BOD 26-04: 60 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 every mission impact level.

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

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 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 partial (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

May 22, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Jun 5, 2026
Patch available. Sources: github, github_commit.
Web pageMentions a patch (unverified)

0037016: CVE-2026-40597: Content Security Policy bypass via attachments - MantisBT

https://mantisbt.org/bugs/view.php?id=37016
GitHub commit

commit 9e3bee2e7b90 (mantisbt/mantisbt)

Fix landed in mantisbt/mantisbt commit 9e3bee2e7b90 — awaiting tagged release

https://github.com/mantisbt/mantisbt/commit/9e3bee2e7b909f4e3596985892b8bc8bee9e0bfe
GitHub advisoryMentions a patch (unverified)

Content Security Policy bypass via attachments · Advisory · mantisbt/mantisbt · GitHub

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-9c3j-xm6v-j7j3

Vendor Advisories for CVE-2026-40597(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
composermantisbt/mantisbt @ 2.28.2 (fixes <= 2.28.1)—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)
Packagist(1)
PackageVulnerable rangeFix by version rangeDependents
mantisbt/mantisbt2.10.0 ... 2.9.1 (76 versions)
  • every version up to 2.28.2: fixed in 2.28.2
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 41× 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 209 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 110 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 0.5% · 42nd percentile
  2. 2026-11-01 07:51 UTCGHSA enrichmentGHSA-9c3j-xm6v-j7j3 · GitHub severity HIGH
  3. 2026-11-01 07:51 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-30 20:45 UTCEG score recompute
  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-25 14:30 UTCEG score recompute
  13. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  14. 2026-10-24 05:50 UTCEG score recompute
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  17. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  19. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  20. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  21. 2026-10-18 03:42 UTCEG score recompute
  22. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  23. 2026-10-17 14:49 UTCEG score recompute
  24. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
Show 74 more
  1. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  3. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  4. 2026-10-12 16:09 UTCEG score recompute
  5. 2026-10-11 19:51 UTCEG score recompute
  6. 2026-10-11 17:05 UTCEG score recompute
  7. 2026-10-11 14:31 UTCEG score recompute
  8. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  9. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  11. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  12. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  13. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  16. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-09-30 02:39 UTCOSV refresh
  20. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  21. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  22. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  23. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  26. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  27. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  28. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  29. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  30. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  31. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  32. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  33. 2026-09-11 03:53 UTCOSV refresh
  34. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  35. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  36. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  37. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  38. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  39. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  40. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  41. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  42. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  43. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  44. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  45. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  46. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  47. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  48. 2026-08-23 16:40 UTCEG score recompute
  49. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  50. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  51. 2026-08-21 21:40 UTCEG score recompute
  52. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  53. 2026-08-20 18:39 UTCEG score recompute
  54. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  55. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  56. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  57. 2026-08-16 16:48 UTCEG score recompute
  58. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  59. 2026-08-16 03:19 UTCEG score recompute
  60. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  61. 2026-08-15 01:49 UTCEG score recompute
  62. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  63. 2026-08-14 01:52 UTCEG score recompute
  64. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  65. 2026-08-12 14:12 UTCEG score recompute
  66. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  67. 2026-08-11 13:46 UTCEG score recompute
  68. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  69. 2026-08-11 01:17 UTCEG score recompute
  70. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  71. 2026-08-10 01:18 UTCEG score recompute
  72. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  73. 2026-08-09 01:21 UTCEG score recompute
  74. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile

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Frequently asked(5)

What is CVE-2026-40597?
CVE-2026-40597 is a high-severity vulnerability; its CVE record was published on May 22, 2026. Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, given any pre-existing XSS / HTML injection vulnerability, an attacker can bypass the Content Security Policy's script-src directive by uploading a crafted attachment to any issue that, when accessed via…
When was the CVE record for CVE-2026-40597 published?
The CVE record for CVE-2026-40597 was published on May 22, 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 July 23, 2026; the record at its source may have been updated since.
Is CVE-2026-40597 actively exploited?
CVE-2026-40597 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-40597?
CVE-2026-40597 has a CVSS base score of 7.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-40597?
A fix for CVE-2026-40597 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-40597 are linked in the Vendor Advisories panel on this page.

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