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VulnerabilityPublished

CVE-2026-55792: craftcms cms · Information Exposure

Affects craftcms cmsSource CVE Database V5

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Not known to be exploited · CVSS 6.0 Medium : upgrade to 5.10.0 or 4.18.0 when convenient.

Data as of 13 Nov 2026, 23:54 UTC

CVSS 4.0 base score
6.0Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 5.10.0, 4.18.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Jul 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade craftcms cms to 5.10.0 or 4.18.0.

Affected software

ProductAffectedFixed in
craftcmscmsAffected
  • >=5.0.0-RC1 <5.10.0
Fixed in
  • 5.10.0
craftcmscmsAffected
  • >=4.0.0-RC1 <4.18.0
Fixed in
  • 4.18.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Craft CMS to version 4.18.0 or later if using the 4.x branch, or to version 5.10.0 or later if using the 5.x branch. These versions contain the fix that removes the vulnerability. Until upgraded, restrict the utility:system-messages permission to trusted users only, as this permission enables exploitation of the vulnerability. Patch status is confirmed fixed in the specified versions.

Description

Craft CMS is a content management system (CMS). In versions starting from 4.0.0-RC1 and prior to 4.18.0, and 5.0.0-RC1 and above, prior to 5.10.0, the dataUrl() Twig function is included in Craft’s Twig sandbox allowlist, allowing any control panel user granted the utility:system-messages permission to embed a file-reading payload into system email templates. When those emails are sent, the server reads the target file and returns its contents as a base64-encoded data URL embedded in the email body. The .env file, which typically contains the database password, CRAFT_SECURITY_KEY, and third-party API keys, passes all of Craft’s existing dataUrl() protection checks and is fully exfiltrated. Obtaining CRAFT_SECURITY_KEY enables an attacker to forge session tokens and escalate to full admin account takeover. This issue has been fixed in versions 4.18.0 and 5.10.0.

References

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