CVE-2026-27833

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.6%, top 26% of all CVEs by exploit prediction. 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, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Piwigo is an open source photo gallery application for the web. Prior to version 16.3.0, the pwg.history.search API method in Piwigo is registered without the admin_only option, allowing unauthenticated users to access the full browsing history of all gallery visitors. This issue has been patched in version 16.3.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
74%
KEV
Not listed

Published

April 3, 2026

Last Modified

July 24, 2026

Advisory Details (3)

Auto-updated Jun 10, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github.
generic

Piwigo 16.3.0 | Release note

https://piwigo.org/release-16.3.0
github Patch Available🟡 PoC Available

Unauthenticated Information Disclosure via pwg.history.search API · Advisory · Piwigo/Piwigo · GitHub

https://github.com/Piwigo/Piwigo/security/advisories/GHSA-397m-gfhm-pmg2
github_commit Patch Available

commit d05c16561ce3 (Piwigo/Piwigo)

Patch available: Piwigo/Piwigo 16.3.0 (contains commit d05c16561ce3)

https://github.com/Piwigo/Piwigo/commit/d05c16561ce3692ca922199f8c8d7b1a45893f1c

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 45× 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.

Showing the most recent 100 of 126 total refreshes for this CVE.

  1. 2026-07-30 16:27 UTCEPSS rescore
  2. 2026-07-30 01:30 UTCEPSS rescore
  3. 2026-07-28 15:36 UTCEPSS rescore
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  6. 2026-07-26 09:16 UTCEG score recompute
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  12. 2026-07-23 03:08 UTCEG score recompute
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  50. 2026-06-13 23:00 UTCEPSS rescore
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  62. 2026-06-06 13:47 UTCEPSS rescore
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  74. 2026-05-31 22:30 UTCEPSS rescore
  75. 2026-05-31 22:30 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-27833.yaml
    First seen Jan 1, 2026

    Piwigo < 16.3.0 - Unauthenticated Information Disclosure via History API

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-27833?
CVE-2026-27833 is a high vulnerability published on April 3, 2026. Piwigo is an open source photo gallery application for the web. Prior to version 16.3.0, the pwg.history.search API method in Piwigo is registered without the admin_only option, allowing unauthenticated users to access the full browsing history of all gallery visitors. This issue has been patched…
When was CVE-2026-27833 disclosed?
CVE-2026-27833 was first published in the National Vulnerability Database on April 3, 2026, with the most recent update on July 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-27833 actively exploited?
CVE-2026-27833 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2% probability of exploitation in the next 30 days, which ranks it in the top 26.0% of all scored CVEs.
What is the CVSS score of CVE-2026-27833?
CVE-2026-27833 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-27833?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-27833, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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