CVE-2026-55792: 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 in

unknownCVE-2026-55792

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: unknown
Published: 2026-07-02
Last updated: 2026-07-02
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55792

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-557920.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55792	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-287w-mxq6-x2cp: Craft CMS: Sensitive File Disclosure / Server-Side File Readghsa

Recent advisories for Craft CMS is

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highGHSA-86vw-x4ww-x467: Craft CMS: RCE via missing cleanseConfig in FieldsController::actionRenderCardPreviewghsa · 2026-07-09
lowGHSA-c43v-4cr8-6mvp: Craft CMS has authenticated path traversal in `assets/icon`, allowing local `.svg` file r…ghsa · 2026-07-09
highGHSA-f74w-488g-8x5r: Craft CMS: Potential authenticated Remote Code Execution via referrer redirectghsa · 2026-07-06
mediumGHSA-xrqc-p465-2xvg: Craft CMS: Stored XSS via Structure entry title in table viewghsa · 2026-07-06
mediumGHSA-287w-mxq6-x2cp: Craft CMS: Sensitive File Disclosure / Server-Side File Readghsa · 2026-07-06
highGHSA-24x4-j6x9-rfw5: Craft CMS: DOM XSS via GitHub issue title in CraftSupport widgetghsa · 2026-07-06