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CVE-2026-79988

Authenticated RCE through Twig sandbox escape

HIGH
8.7
CVSS Score
Published: August 27, 2026 at 03:36 PM UTC
Updated: August 28, 2026 at 08:20 PM UTC
1 product affected across 1 vendorCraftcms

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

The Twig sandbox mechanism in Craft CMS is configured to allow dangerous functionality from the Yii framework, leading to authenticated RCE similar to previously disclosed vulnerabilities.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Craftcms· Craftcmscomposer
90%
4.0.0-RC1 ≤ v < 4.18.35.0.0-rc1 ≤ v < 5.10.74.0.0-RC15.0.0-RC1
Affected range stops below 4.18.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.10.7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Third Party AdvisoryTechnical DescriptionMitigation
Source: cverecord
https://www.hckrt.com/hacktivity/HCKRT-8RQQ7K
Release Notes
Source: cverecord
https://github.com/craftcms/cms/releases/tag/5.10.7
Product
Source: cverecord
https://github.com/craftcms/cms

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHHackrate
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-693

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