Vulnerability · Published Aug 14, 2026 · Assigned by GitHub_M

CVE-2026-73849emlog allows unauthenticated reinstallation via `install.php?action=reinstall`.

Critical 9.8

In plain English

A critical-severity missing authentication in emlog from emlog. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.7%top 45.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Emlog is an open source website building system. In 2.6.26 and earlier, install.php accepts action=reinstall without authentication and deliberately skips the already-installed check because the guard runs only when $act != 'reinstall'. A remote attacker can submit hostname, dbuser, dbpasswd, dbname, dbprefix, username, password, and email values to cause file_put_contents('config.php', $config) to overwrite the configuration with attacker-controlled database settings and create a new administrator account. No fixed version is available as of this review.

Affected products (as reported)

Vendor	Product	Versions
emlog	emlog	<= 2.6.26

Weakness: CWE-306 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/emlog/emlog/security/advisories/GHSA-v5qq-p8mp-3gxm x_refsource_CONFIRM