CVE-2026-42322

CRITICALPre-NVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 1.3% (69th 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
Elevated

Also known asEUVD-2026-87139 (ENISA EUVD)Source: ENISA EUVD

9.1EG
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).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 1.3%CVSS: 9.1Exploit: No code on recordExposed 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 57/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (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
1.3%
EPSS %ILE
69th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
1.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track* at medium mission impactTrack at low, Track* at medium and Attend at high mission impact.CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). 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)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (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

September 25, 2026

Last Modified

September 28, 2026

Advisory Details (4)

Auto-updated Sep 25, 2026
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 advisoryMentions a patch (unverified)

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 14× in last 7d / 64× 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. 2026-11-01 19:08 UTCEG score recompute
  2. 2026-11-01 16:34 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  3. 2026-10-31 21:27 UTCEG score recompute
  4. 2026-10-31 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  5. 2026-10-30 23:49 UTCEG score recompute
  6. 2026-10-30 16:34 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  7. 2026-10-30 02:09 UTCEG score recompute
  8. 2026-10-29 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  9. 2026-10-29 04:31 UTCEG score recompute
  10. 2026-10-28 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  11. 2026-10-28 06:43 UTCEG score recompute
  12. 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  13. 2026-10-27 09:05 UTCEG score recompute
  14. 2026-10-26 16:31 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  15. 2026-10-26 10:22 UTCEG score recompute
  16. 2026-10-25 16:33 UTCEPSS rescoreEPSS 1.3% · 69th percentile
  17. 2026-10-25 14:29 UTCEG score recompute
  18. 2026-10-25 12:43 UTCEG score recompute
  19. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  20. 2026-10-23 17:24 UTCEG score recompute
  21. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  22. 2026-10-22 19:45 UTCEG score recompute
  23. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-21 22:05 UTCEG score recompute
  25. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
Show 55 more
  1. 2026-10-21 00:00 UTCEG score recompute
  2. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  3. 2026-10-20 02:19 UTCEG score recompute
  4. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  5. 2026-10-19 01:40 UTCEG score recompute
  6. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  7. 2026-10-18 03:41 UTCEG score recompute
  8. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  9. 2026-10-17 06:19 UTCEG score recompute
  10. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  11. 2026-10-16 07:36 UTCEG score recompute
  12. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  13. 2026-10-15 06:31 UTCEG score recompute
  14. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  15. 2026-10-14 02:11 UTCEG score recompute
  16. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  17. 2026-10-12 22:31 UTCEG score recompute
  18. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  19. 2026-10-12 16:07 UTCEG score recompute
  20. 2026-10-11 19:49 UTCEG score recompute
  21. 2026-10-11 17:03 UTCEG score recompute
  22. 2026-10-11 14:04 UTCEG score recompute
  23. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.5% · 43rd percentile
  24. 2026-10-10 22:43 UTCEG score recompute
  25. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  26. 2026-10-09 23:48 UTCEG score recompute
  27. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  28. 2026-10-08 20:46 UTCEG score recompute
  29. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  30. 2026-10-08 02:46 UTCEG score recompute
  31. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  32. 2026-10-06 16:25 UTCEG score recompute
  33. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  34. 2026-10-05 21:19 UTCEG score recompute
  35. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  36. 2026-10-05 02:14 UTCEG score recompute
  37. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  38. 2026-10-03 15:47 UTCEG score recompute
  39. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  40. 2026-10-02 16:41 UTCEG score recompute
  41. 2026-10-01 21:32 UTCEG score recompute
  42. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  43. 2026-09-30 15:06 UTCEG score recompute
  44. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  45. 2026-09-29 18:18 UTCEG score recompute
  46. 2026-09-28 23:12 UTCEG score recompute
  47. 2026-09-28 15:33 UTCEG score recompute
  48. 2026-09-28 14:42 UTCEG score recompute
  49. 2026-09-27 14:18 UTCEG score recompute
  50. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  51. 2026-09-26 19:14 UTCEG score recompute
  52. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  53. 2026-09-25 16:26 UTCEG score recompute
  54. 2026-09-25 15:54 UTCEG score recomputeFirst assessed: 9.1 CRITICAL
  55. 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-severity vulnerability; its CVE record was published on September 25, 2026. 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…
When was the CVE record for CVE-2026-42322 published?
The CVE record for CVE-2026-42322 was published on September 25, 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 28, 2026; the record at its source may have been updated since.
Is CVE-2026-42322 actively exploited?
CVE-2026-42322 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.3% probability of exploitation in the next 30 days (69th 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.

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