CVE-2026-42322

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). 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, secondary
Elevated
9.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.1Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

Piwigo is a full featured open source photo gallery application for the web. Prior to 16.4.0, admin/themes_standard_pages.php validates uploaded logo content by MIME type but reuses the attacker-controlled extension from std_pgs_logo when constructing the stored filename. An authenticated administrator can upload image content with a server-executable final extension, causing the file to be placed in the web-accessible logo directory and executed when requested if the web server handles that extension. This can permit arbitrary command execution, data disclosure, modification, persistence, and service disruption. This vulnerability is fixed in 16.4.0.

CVSS v3
9.1
EG Score
9.1CRITICALmedium confidence
EG Risk
57
EG Risk 57/100CISA SSVC

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
Severity91% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
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
0.5%
EPSS %ILE
42nd
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

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

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 25, 2026

Last Modified

September 28, 2026

Advisory Details (4)

Auto-updated Sep 25, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
github_release Patch Available

16.4.0

Patch available: Piwigo/Piwigo 16.4.0

https://github.com/Piwigo/Piwigo/releases/tag/16.4.0
github_commit

commit 4a13ec9a8f48 (Piwigo/Piwigo)

Fix landed in Piwigo/Piwigo commit 4a13ec9a8f48 — awaiting tagged release

https://github.com/Piwigo/Piwigo/commit/4a13ec9a8f4881ae1f23bdfd24d7b90cd0802cdc
github_commit Patch Available

commit 1e7f7262cb30 (Piwigo/Piwigo)

Patch available: Piwigo/Piwigo 16.4.0 (contains commit 1e7f7262cb30)

https://github.com/Piwigo/Piwigo/commit/1e7f7262cb30e6916779f93e66d5d6579ec75a11
github Patch Available🟡 PoC Available

Authenticated RCE via File Upload in Logo Upload Feature · Advisory · Piwigo/Piwigo · GitHub

https://github.com/Piwigo/Piwigo/security/advisories/GHSA-7w97-5g4p-xqvv

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 18× 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.

  1. 2026-10-03 15:47 UTCEG score recompute
  2. 2026-10-03 14:25 UTCEPSS rescore
  3. 2026-10-02 16:41 UTCEG score recompute
  4. 2026-10-01 21:32 UTCEG score recompute
  5. 2026-10-01 19:50 UTCEPSS rescore
  6. 2026-09-30 15:06 UTCEG score recompute
  7. 2026-09-30 15:03 UTCEPSS rescore
  8. 2026-09-29 18:18 UTCEG score recompute
  9. 2026-09-28 23:12 UTCEG score recompute
  10. 2026-09-28 15:33 UTCEG score recompute
  11. 2026-09-28 14:42 UTCEG score recompute
  12. 2026-09-27 14:18 UTCEG score recompute
  13. 2026-09-27 13:48 UTCEPSS rescore
  14. 2026-09-26 19:14 UTCEG score recompute
  15. 2026-09-26 15:58 UTCEPSS rescore
  16. 2026-09-25 16:26 UTCEG score recompute
  17. 2026-09-25 15:54 UTCEG score recompute
  18. 2026-09-25 15:54 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-42322?
CVE-2026-42322 is a critical vulnerability published on September 25, 2026. Piwigo is a full featured open source photo gallery application for the web. Prior to 16.4.0, admin/themesstandardpages.php validates uploaded logo content by MIME type but reuses the attacker-controlled extension from stdpgslogo when constructing the stored filename. An authenticated administrator…
When was CVE-2026-42322 disclosed?
CVE-2026-42322 was first published on September 25, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42322 actively exploited?
CVE-2026-42322 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-2026-42322?
CVE-2026-42322 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-42322?
A fix for CVE-2026-42322 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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