CVE-2026-39960

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% (19th 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
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.

Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bug_update_page.php) allowing an attacker to inject HTML and, if CSP settings permit, execute arbitrary JavaScript when the page is loaded. This facilitates session theft, leading to admin account takeover, full project data access. In order to exploit this issue, a textarea-type custom field must be configured for the project, the attack must be carried out by an authenticated user with bug report permission (low privilege). This can affect any user viewing the bug edit form, including administrators. The issue has been fixed in version 2.28.2. If users cannot immediately upgrade, they can work around the issue by using the default Content-Security Policy, which blocks script execution.

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 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)
Severity54% × 45%
The EG Score, 5.4 of 10.
Exploitation0.3% × 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
0.3%
EPSS %ILE
19th
KEV
Not listed

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.

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 20, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jun 16, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

Stored XSS in Custom Field Textarea Values · Advisory · mantisbt/mantisbt · GitHub

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-qj6w-v29q-4rgx
GitHub commit

commit 5fec0f448b7a (mantisbt/mantisbt)

Fix landed in mantisbt/mantisbt commit 5fec0f448b7a — awaiting tagged release

https://github.com/mantisbt/mantisbt/commit/5fec0f448b7a7d7d539a6adb6dccceac4e4e4ab7

Vendor Advisories for CVE-2026-39960(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 / 28× 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 95 of 182 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. 5 repeat rows among the latest 100 are merged into the row they repeat. The 87 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 0.3% · 19th percentile
  2. 2026-10-12 16:10 UTCEG score recompute
  3. 2026-10-11 19:52 UTCEG score recompute
  4. 2026-10-11 17:05 UTCEG score recompute
  5. 2026-10-11 14:32 UTCEG score recompute
  6. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  9. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  14. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  15. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  17. 2026-09-30 03:10 UTCOSV refresh
  18. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  22. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  23. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-17 19:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  25. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 13th percentile
Show 70 more
  1. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  2. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  3. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  4. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  5. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  6. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  7. 2026-09-11 05:23 UTCOSV refresh
  8. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  9. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  10. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  11. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  12. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  13. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  14. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  15. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  16. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  17. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  18. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  19. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  20. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  21. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  22. 2026-08-23 16:52 UTCEG score recompute
  23. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-08-21 22:52 UTCEG score recompute
  26. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  27. 2026-08-20 18:53 UTCEG score recompute
  28. 2026-08-19 17:03 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  29. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  30. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  31. 2026-08-17 09:50 UTCEG score recompute
  32. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  33. 2026-08-16 03:28 UTCEG score recompute
  34. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  35. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  36. 2026-08-14 12:15 UTCEG score recompute
  37. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  38. 2026-08-13 11:03 UTCEG score recompute
  39. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  40. 2026-08-12 09:51 UTCEG score recompute
  41. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  42. 2026-08-11 05:43 UTCEG score recompute
  43. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  44. 2026-08-10 04:31 UTCEG score recompute
  45. 2026-08-09 13:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  46. 2026-08-09 03:19 UTCEG score recompute
  47. 2026-08-08 16:37 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-08-08 02:07 UTCEG score recompute
  49. 2026-08-07 00:55 UTCEG score recompute
  50. 2026-08-06 13:46 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  51. 2026-08-05 21:15 UTCEG score recompute
  52. 2026-08-05 19:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  53. 2026-08-04 15:10 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  54. 2026-08-04 10:38 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  55. 2026-08-03 20:01 UTCEG score recompute
  56. 2026-08-03 10:36 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  57. 2026-08-02 18:49 UTCEG score recompute
  58. 2026-08-02 02:27 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  59. 2026-08-01 17:36 UTCEG score recompute
  60. 2026-08-01 04:16 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  61. 2026-07-30 16:28 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  62. 2026-07-30 01:30 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  63. 2026-07-29 18:21 UTCEG score recompute
  64. 2026-07-27 14:13 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  65. 2026-07-26 14:54 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  66. 2026-07-26 08:13 UTCEG score recompute
  67. 2026-07-25 14:18 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  68. 2026-07-24 14:17 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  69. 2026-07-23 14:18 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  70. 2026-07-23 03:10 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-39960?
CVE-2026-39960 is a medium-severity vulnerability; its CVE record was published on May 20, 2026. Mantis Bug Tracker (MantisBT) is an open source issue tracker. Versions 2.28.1 and below contain flawed logic that causes improper escaping of a textarea custom field's contents in the Update Issue page, (bugupdatepage.php) allowing an attacker to inject HTML and, if CSP settings permit, execute…
When was the CVE record for CVE-2026-39960 published?
The CVE record for CVE-2026-39960 was published on May 20, 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-2026-39960 actively exploited?
CVE-2026-39960 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (19th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-39960?
CVE-2026-39960 has a CVSS v3 base score of 5.4 (NVD).
How do I remediate CVE-2026-39960?
A fix for CVE-2026-39960 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-39960 are linked in the Vendor Advisories panel on this page.

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