SummaryAI-written · claude-haiku-5-5AI-written · claude-haiku-5-5Written by a language model from the source data on this page. Not reviewed by a person. Generated 29 Oct 2026.
Unsafe deserialization in the Yii 2 PHP framework (yiisoft/yii2, the yii2 product from yiisoft) affects versions before 2.0.38 and lives in the application's handling of serialized data. An attacker who can supply arbitrary input that the application passes to unserialize() can achieve remote code execution, though the attack is conditional on the application actually calling unserialize() on that untrusted input and on the attacker reaching it over the network without authentication or user interaction.
Official description · CVE.orgSource dataSource dataCopied from an authoritative feed: NVD, CVE.org, CISA KEV, FIRST EPSS or MITRE CTID mappings, or labelled by the annotators of a published dataset. Copied from CVE.org.
Yii 2 (yiisoft/yii2) before version 2.0.38 is vulnerable to remote code execution if the application calls `unserialize()` on arbitrary user input. This is fixed in version 2.0.38. A possible workaround without upgrading is available in the linked advisory.
Priority scorePatchfirst’s 0 to 100 ranking. It adds points for CISA KEV listing, ransomware use, EPSS, threat reports, public exploit code and CVSS. Every CVE page shows the breakdown.Breakdown
31.1 / 100
Exploited
Not confirmed
Reports
0
Tactics
0/15
Exploitation timelineDated milestones for a CVE: when it was disclosed, when exploit code became public, when exploitation was confirmed, and when threat reports named it.
Public exploit code (PoC-in-GitHub) appeared 6 days after disclosure. No confirmed exploitation is recorded.
Patch historyEarlier and later CVEs in the same code, in date order. It shows when a fix was bypassed or incomplete and which version finally fixed it.
7 fixes in yiisoft/yii2 over 7 years. The latest fix listed for yiisoft/yii2 is 2.0.52.
Fixes in yiisoft/yii2Packagist package, by fixed version. Earlier and later fixes in the same package, not necessarily the same bug.
MITRE ATT&CKA public catalogue of the techniques attackers use, maintained by MITRE. Patchfirst uses it to describe what attackers do with a vulnerability. techniques
No techniques linked
No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.
Am I affected? What do I upgrade to?
From GitHub Security Advisories and OSVSourceSource dataCopied from an authoritative feed: NVD, CVE.org, CISA KEV, FIRST EPSS or MITRE CTID mappings, or labelled by the annotators of a published dataset. GitHub Security Advisories and OSV.
1 package in 1 ecosystem. Main package: yiisoft/yii2.