CVE-2026-40598

MEDIUMNVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.9Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, improper escaping of the redirection page (retrieved from the request's Referer header) allows an attacker to inject HTML. While this is generally not directly actionable as modern browsers will URL-encode special characters, on some specific server configurations this could poison the cache, leading to cross-site scripting. This issue has been fixed in version 2.28.2.

CVSS v3
6.9
EG Score
6.9(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity69% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

May 22, 2026

Last Modified

July 23, 2026

Advisory Details (3)

Auto-updated Jun 11, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
generic Patch Available

0037017: CVE-2026-40598 : Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page - MantisBT

https://mantisbt.org/bugs/view.php?id=37017
github Patch Available🟡 PoC Available

Potential Referer-Based Reflected HTML Injection / XSS in Tag Update Page · Advisory · mantisbt/mantisbt · GitHub

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-6jh4-47v2-4g37
github_commit

commit b1ebc57763f1 (mantisbt/mantisbt)

Fix landed in mantisbt/mantisbt commit b1ebc57763f1 — awaiting tagged release

https://github.com/mantisbt/mantisbt/commit/b1ebc57763f104eb5f541b7b4d1ce6948168abd9

Vendor Advisories for CVE-2026-40598(1)

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

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
mantisbt/mantisbt2.10.0 ... 2.9.1 (76 versions)2.28.2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 125 total refreshes for this CVE.

  1. 2026-08-15 01:30 UTCEPSS rescore
  2. 2026-08-14 01:52 UTCEG score recompute
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-12 21:27 UTCEG score recompute
  5. 2026-08-12 13:51 UTCEPSS rescore
  6. 2026-08-11 22:58 UTCEG score recompute
  7. 2026-08-11 13:43 UTCEPSS rescore
  8. 2026-08-11 00:29 UTCEG score recompute
  9. 2026-08-11 00:00 UTCEPSS rescore
  10. 2026-08-09 23:50 UTCEG score recompute
  11. 2026-08-09 13:46 UTCEPSS rescore
  12. 2026-08-09 01:21 UTCEG score recompute
  13. 2026-08-08 16:37 UTCEPSS rescore
  14. 2026-08-07 18:09 UTCEG score recompute
  15. 2026-08-06 19:40 UTCEG score recompute
  16. 2026-08-06 13:46 UTCEPSS rescore
  17. 2026-08-05 21:10 UTCEG score recompute
  18. 2026-08-05 19:17 UTCEPSS rescore
  19. 2026-08-04 15:10 UTCEPSS rescore
  20. 2026-08-04 10:38 UTCEPSS rescore
  21. 2026-08-03 16:47 UTCEG score recompute
  22. 2026-08-03 10:36 UTCEPSS rescore
  23. 2026-08-02 15:40 UTCEG score recompute
  24. 2026-08-02 02:27 UTCEPSS rescore
  25. 2026-08-01 17:11 UTCEG score recompute
Show 75 more
  1. 2026-08-01 04:16 UTCEPSS rescore
  2. 2026-07-30 16:28 UTCEPSS rescore
  3. 2026-07-30 01:30 UTCEPSS rescore
  4. 2026-07-29 17:29 UTCEG score recompute
  5. 2026-07-28 15:36 UTCEPSS rescore
  6. 2026-07-27 14:13 UTCEPSS rescore
  7. 2026-07-26 14:54 UTCEPSS rescore
  8. 2026-07-26 14:54 UTCEPSS rescore
  9. 2026-07-26 08:05 UTCEG score recompute
  10. 2026-07-25 14:18 UTCEPSS rescore
  11. 2026-07-24 14:17 UTCEPSS rescore
  12. 2026-07-24 14:17 UTCEPSS rescore
  13. 2026-07-23 14:18 UTCEPSS rescore
  14. 2026-07-23 14:18 UTCEPSS rescore
  15. 2026-07-23 03:11 UTCEG score recompute
  16. 2026-07-22 14:08 UTCEPSS rescore
  17. 2026-07-21 15:24 UTCEPSS rescore
  18. 2026-07-20 17:08 UTCEPSS rescore
  19. 2026-07-19 14:31 UTCEPSS rescore
  20. 2026-07-19 02:29 UTCEPSS rescore
  21. 2026-07-18 10:04 UTCEPSS rescore
  22. 2026-07-17 04:24 UTCOSV refresh
  23. 2026-07-16 17:03 UTCEPSS rescore
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 16:57 UTCEPSS rescore
  26. 2026-07-15 02:00 UTCEPSS rescore
  27. 2026-07-13 22:30 UTCEPSS rescore
  28. 2026-07-13 06:13 UTCEPSS rescore
  29. 2026-07-13 06:13 UTCEPSS rescore
  30. 2026-07-12 05:46 UTCEPSS rescore
  31. 2026-07-11 08:27 UTCEPSS rescore
  32. 2026-07-09 19:10 UTCEPSS rescore
  33. 2026-07-08 15:15 UTCEPSS rescore
  34. 2026-07-07 13:46 UTCEPSS rescore
  35. 2026-07-06 16:27 UTCEPSS rescore
  36. 2026-07-06 16:27 UTCEPSS rescore
  37. 2026-07-06 02:23 UTCEPSS rescore
  38. 2026-07-06 02:23 UTCEPSS rescore
  39. 2026-07-05 02:30 UTCEPSS rescore
  40. 2026-07-04 06:31 UTCEPSS rescore
  41. 2026-07-01 15:06 UTCEPSS rescore
  42. 2026-06-30 23:22 UTCEPSS rescore
  43. 2026-06-29 14:06 UTCEPSS rescore
  44. 2026-06-28 14:07 UTCEPSS rescore
  45. 2026-06-28 04:56 UTCEPSS rescore
  46. 2026-06-27 03:08 UTCEPSS rescore
  47. 2026-06-25 13:49 UTCEPSS rescore
  48. 2026-06-25 13:49 UTCEPSS rescore
  49. 2026-06-24 14:05 UTCEPSS rescore
  50. 2026-06-23 21:33 UTCEPSS rescore
  51. 2026-06-22 14:25 UTCEPSS rescore
  52. 2026-06-22 14:25 UTCEPSS rescore
  53. 2026-06-21 14:56 UTCEPSS rescore
  54. 2026-06-21 14:56 UTCEPSS rescore
  55. 2026-06-21 01:59 UTCEPSS rescore
  56. 2026-06-19 19:25 UTCEPSS rescore
  57. 2026-06-18 17:52 UTCEPSS rescore
  58. 2026-06-18 17:52 UTCEPSS rescore
  59. 2026-06-17 17:53 UTCEPSS rescore
  60. 2026-06-16 17:52 UTCEPSS rescore
  61. 2026-06-15 17:49 UTCEPSS rescore
  62. 2026-06-13 23:00 UTCEPSS rescore
  63. 2026-06-12 23:12 UTCEPSS rescore
  64. 2026-06-12 23:12 UTCEPSS rescore
  65. 2026-06-11 14:00 UTCEPSS rescore
  66. 2026-06-10 22:18 UTCEPSS rescore
  67. 2026-06-10 13:22 UTCEPSS rescore
  68. 2026-06-10 13:22 UTCEPSS rescore
  69. 2026-06-08 14:17 UTCEPSS rescore
  70. 2026-06-08 14:17 UTCEPSS rescore
  71. 2026-06-07 15:25 UTCEPSS rescore
  72. 2026-06-07 15:25 UTCEPSS rescore
  73. 2026-06-06 13:47 UTCEPSS rescore
  74. 2026-06-06 13:47 UTCEPSS rescore
  75. 2026-06-05 22:47 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-40598?
CVE-2026-40598 is a medium vulnerability published on May 22, 2026. Mantis Bug Tracker (MantisBT) is an open source issue tracker. In versions 2.28.1 and below, improper escaping of the redirection page (retrieved from the request's Referer header) allows an attacker to inject HTML. While this is generally not directly actionable as modern browsers will URL-encode…
When was CVE-2026-40598 disclosed?
CVE-2026-40598 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40598 actively exploited?
CVE-2026-40598 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.9% of all scored CVEs.
What is the CVSS score of CVE-2026-40598?
CVE-2026-40598 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-40598?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40598, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-40598

Explore →

Is Your Infrastructure Affected by CVE-2026-40598?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs