Improper Input Validation Affecting adminer package, versions <6.0.0-1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIANUNSTABLE-ADMINER-19270584
- published27 Aug 2026
- disclosed25 Aug 2026
Introduced: 25 Aug 2026
NewCVE-2026-16434 (opens in a new tab)How to fix?
Upgrade Debian:unstable adminer to version 6.0.0-1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream adminer package and not the adminer package as distributed by Debian.
See How to fix? for Debian:unstable relevant fixed versions and status.
Adminer 4.6.0 through 5.5.0 (fixed in 5.5.1) contains an incomplete fix for a prior X-Forwarded-Prefix vulnerability (GHSA-8478-xrj3-h9c2). The validation guard (bootstrap.inc.php) only rejects prefixes matching ^/[^/], blocking //evil.com but allowing values such as /\evil.com whose second character is a backslash. Because browsers normalize backslash to forward slash, a network-path reference survives into REQUEST_URI and reaches cookie_path(), affecting the Set-Cookie Path attribute. Exploitation requires that clients can set the X-Forwarded-Prefix header (a misconfigured or absent reverse proxy). Impact is limited to anomalous cookie-path scoping.