CVE-2026-40598

MEDIUMNVD 6.96.9
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.9 under NVD CVSS v3. 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 NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
6.9EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (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: 0.5%CVSS: 6.9Exploit: No code on recordExposed 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, 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
6.9MEDIUMmedium confidence
EG Risk
47
EG Risk 47/100

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 (value × EchelonGraph’s weight)
Severity69% × 45%
The EG Score, 6.9 of 10.
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 or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (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

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 public PoC (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.

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 11, 2026
Patch available. Sources: github, github_commit.
Web pageMentions a patch (unverified)

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 advisoryMentions a patch (unverified)

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 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(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 27× 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 96 of 180 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. 4 repeat rows among the latest 100 are merged into the row they repeat. The 84 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-12 16:09 UTCEG score recompute
  3. 2026-10-11 19:51 UTCEG score recompute
  4. 2026-10-11 17:05 UTCEG score recompute
  5. 2026-10-11 14:31 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  11. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  15. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  17. 2026-09-30 02:40 UTCOSV refresh
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  19. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  20. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  21. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  23. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 38th percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 37th percentile
Show 71 more
  1. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  4. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  6. 2026-09-11 03:53 UTCOSV refresh
  7. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  13. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  14. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  15. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  16. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  17. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  18. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  19. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  20. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  21. 2026-08-23 16:40 UTCEG score recompute
  22. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  23. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  24. 2026-08-21 21:40 UTCEG score recompute
  25. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  26. 2026-08-20 18:39 UTCEG score recompute
  27. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  28. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  29. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  30. 2026-08-17 09:43 UTCEG score recompute
  31. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  32. 2026-08-16 03:19 UTCEG score recompute
  33. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  34. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  35. 2026-08-14 01:52 UTCEG score recompute
  36. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  37. 2026-08-12 21:27 UTCEG score recompute
  38. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  39. 2026-08-11 22:58 UTCEG score recompute
  40. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  41. 2026-08-11 00:29 UTCEG score recompute
  42. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  43. 2026-08-09 23:50 UTCEG score recompute
  44. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  45. 2026-08-09 01:21 UTCEG score recompute
  46. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  47. 2026-08-07 18:09 UTCEG score recompute
  48. 2026-08-06 19:40 UTCEG score recompute
  49. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  50. 2026-08-05 21:10 UTCEG score recompute
  51. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  52. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  53. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  54. 2026-08-03 16:47 UTCEG score recompute
  55. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  56. 2026-08-02 15:40 UTCEG score recompute
  57. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  58. 2026-08-01 17:11 UTCEG score recompute
  59. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  60. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  61. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  62. 2026-07-29 17:29 UTCEG score recompute
  63. 2026-07-28 15:36 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  64. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  65. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  66. 2026-07-26 08:05 UTCEG score recompute
  67. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  68. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  69. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  70. 2026-07-23 03:11 UTCEG score recompute
  71. 2026-07-22 14:08 UTCEPSS rescoreEPSS 0.4% · 36th percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-40598?
CVE-2026-40598 is a medium-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, 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 the CVE record for CVE-2026-40598 published?
The CVE record for CVE-2026-40598 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-2026-40598 actively exploited?
CVE-2026-40598 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-2026-40598?
CVE-2026-40598 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-40598?
A fix for CVE-2026-40598 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-40598 are linked in the Vendor Advisories panel on this page.

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