Vulnerability · Published May 17, 2026 · Assigned by VulDB

CVE-2026-8739Sanluan PublicCMS SafeConfigComponent.java getSignKey hard-coded key

Medium 5.3

In plain English

A medium-severity security flaw in PublicCMS from Sanluan. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)5.3Medium

Exploit odds (30 days)0.3%top 79.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A vulnerability was detected in Sanluan PublicCMS 5.202506.d. The affected element is the function getSignKey of the file publiccms-core/src/main/java/com/publiccms/logic/component/config/SafeConfigComponent.java. The manipulation of the argument privatefile_key results in use of hard-coded cryptographic key . The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected products (as reported)

Vendor	Product	Versions
Sanluan	PublicCMS	5.202506.d

Weakness: CWE-321, CWE-320 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:X/RC:R

References

VDB-364327 | Sanluan PublicCMS SafeConfigComponent.java getSignKey hard-coded key vdb-entry, technical-description
VDB-364327 | CTI Indicators (IOB, IOC, TTP, IOA) signature, permissions-required
Submit #809917 | PublicCMS V5.202506.d Anonymous Private File Download third-party-advisory
https://vulnplus-note.wetolink.com/share/PCVUlOncmwTC exploit