CVE-2026-47156

CRITICALPre-NVD 9.39.3
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.7% (51st 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
9.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 9.3Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

MantisBT is an open source bug tracker. Versions 2.28.3 and earlier contain a critical authentication bypass in the SOAP API's mci_check_login() function. Any user knowing any valid cookie_string can authenticate as any other user (knowing their username), including the administrator, without knowing the target's password. The vulnerability is exploitable with zero prior access on default MantisBT installations because self-registration is enabled by default ($g_allow_signup = ON). A self-registered user can use their own cookie_string (readable from their browser's MANTIS_STRING_COOKIE cookie after login) to impersonate the administrator via the SOAP API. The REST API is NOT affected. The REST API's AuthMiddleware derives the username server-side from the API token or session cookie, so the username cannot be spoofed. The Web UI is NOT affected. The Web UI authenticates via PHP session cookies (PHPSESSID) and validates the MANTIS_STRING_COOKIE against the logged-in user through auth_is_cookie_valid(). The username is derived server-side from the cookie, not supplied by the client. Version 2.28.4 contains a patch. No known workarounds are available.

CVSS v3
9.3
EG Score
9.3CRITICALmedium confidence
EG Risk
57
EG Risk 57/100

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)
Severity93% × 45%
The EG Score, 9.3 of 10.
Exploitation0.7% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.7%
EPSS %ILE
51st
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 15, 2026

Last Modified

September 10, 2026

Advisory Details (3)

Auto-updated Oct 3, 2026
Patch available. Sources: github_commit, github.
Web pageMentions a patch (unverified)

0037121: CVE-2026-47156: SOAP API Authentication Bypass -> Privilege Escalation to Administrator - MantisBT

https://mantisbt.org/bugs/view.php?id=37121
GitHub advisoryMentions a patch (unverified)

SOAP API Authentication Bypass with Privilege Escalation to Administrator · Advisory · mantisbt/mantisbt · GitHub

https://github.com/mantisbt/mantisbt/security/advisories/GHSA-c2xg-qjqw-2v98
GitHub commit

commit e3571c319b17 (mantisbt/mantisbt)

Fix landed in mantisbt/mantisbt commit e3571c319b17 — awaiting tagged release

https://github.com/mantisbt/mantisbt/commit/e3571c319b1721b41b0dc4b5b5203cbdcbe0c2ee

Vendor Advisories for CVE-2026-47156(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 (78 versions)
  • every version up to 2.28.4: fixed in 2.28.4
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 33× 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.

  1. 2026-10-14 02:04 UTCEG score recompute
  2. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  3. 2026-10-12 22:22 UTCEG score recompute
  4. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  5. 2026-10-12 16:02 UTCEG score recompute
  6. 2026-10-11 19:45 UTCEG score recompute
  7. 2026-10-11 16:59 UTCEG score recompute
  8. 2026-10-11 14:24 UTCEG score recompute
  9. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  12. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.7% · 51st percentile
  15. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  16. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  17. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  18. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  19. 2026-10-01 12:40 UTCEG score recompute
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  21. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  22. 2026-09-28 08:44 UTCEG score recompute
  23. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  24. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 50th percentile
  25. 2026-09-26 00:27 UTCEPSS rescoreEPSS 0.7% · 50th percentile
Show 24 more
  1. 2026-09-24 08:50 UTCEG score recompute
  2. 2026-09-23 17:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-09-23 03:16 UTCEG score recompute
  4. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-09-18 04:45 UTCEG score recompute
  7. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  9. 2026-09-13 23:12 UTCEG score recompute
  10. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-09-12 16:48 UTCEG score recompute
  12. 2026-09-12 15:01 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-09-11 21:45 UTCEG score recompute
  14. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-09-11 09:37 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-09-10 15:28 UTCEG score recompute
  17. 2026-09-10 15:01 UTCEG score recompute
  18. 2026-09-09 17:34 UTCEG score recompute
  19. 2026-09-09 16:30 UTCEG score recomputeFirst assessed: 9.3 CRITICAL
  20. 2026-09-09 16:25 UTCMITRE cvelistV5CVSS v3 → 9.3 · CVSS v4 → 9.3
  21. 2026-08-01 09:23 UTCEG score recompute
  22. 2026-07-26 11:35 UTCEG score recompute
  23. 2026-07-23 03:17 UTCEG score recompute
  24. 2026-07-15 16:54 UTCEG score recompute

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Frequently asked(5)

What is CVE-2026-47156?
CVE-2026-47156 is a critical-severity vulnerability; its CVE record was published on July 15, 2026. MantisBT is an open source bug tracker. Versions 2.28.3 and earlier contain a critical authentication bypass in the SOAP API's mcichecklogin() function. Any user knowing any valid cookiestring can authenticate as any other user (knowing their username), including the administrator, without knowing…
When was the CVE record for CVE-2026-47156 published?
The CVE record for CVE-2026-47156 was published on July 15, 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 September 10, 2026; the record at its source may have been updated since.
Is CVE-2026-47156 actively exploited?
CVE-2026-47156 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (51st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-47156?
CVE-2026-47156 has a CVSS base score of 9.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-47156?
A fix for CVE-2026-47156 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-47156 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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