CVE-2024-32877Public exploitNetwork attack vector

Reflected XSS via unquoted stack-trace arguments

Published May 30, 2024 · Updated Aug 2, 2024

Reflected XSS in Yii 2 2.0.49.3 allows remote attackers to execute JavaScript through crafted stack-trace arguments. ErrorHandler::htmlEncode uses ENT_NOQUOTES when placing truncated arguments longer than 32 characters in a span title, so a double quote escapes the attribute and injects an event handler. Exploitation requires debug mode, visible stack traces, zend.exception_ignore_args disabled, an attacker-induced exception, and user interaction with the rendered trace.

CVSS severity4.2
Medium
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Yii 2 2.0.49.3 allows remote attackers to execute JavaScript through crafted stack-trace arguments. ErrorHandler::htmlEncode uses ENT_NOQUOTES when placing truncated arguments longer than 32 characters in a span title, so a double quote escapes the attribute and injects an event handler. Exploitation requires debug mode, visible stack traces, zend.exception_ignore_args disabled, an attacker-induced exception, and user interaction with the rendered trace.

The record

CVE
CVE-2024-32877
Published
May 30, 2024
Updated
Aug 2, 2024
Vendor
Yiisoft
Product
Yii 2
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 30, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion== 2.0.49.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Yiisoft · Yii 2version== 2.0.49.3

Published CVSS scores

4.2GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
4.7NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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