CVE-2026-88058Public exploitNetwork attack vector

SSR XSS via unescaped processing instruction data

Published Sep 10, 2026 · Updated Sep 10, 2026

XSS in Angular server-side rendering allows remote attackers to execute arbitrary JavaScript in victims' browsers through crafted input. The @angular/platform-server serializer leaves less-than characters and matching fallback-container closing tags unescaped in ProcessingInstruction data, so HTML5 RAWTEXT parsing activates following sibling markup. Reachability requires application or library code to create such a node with attacker-controlled data inside noscript, iframe, noembed, or noframes.

CVSS severity8.6
High
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

XSS in Angular server-side rendering allows remote attackers to execute arbitrary JavaScript in victims' browsers through crafted input. The @angular/platform-server serializer leaves less-than characters and matching fallback-container closing tags unescaped in ProcessingInstruction data, so HTML5 RAWTEXT parsing activates following sibling markup. Reachability requires application or library code to create such a node with attacker-controlled data inside noscript, iframe, noembed, or noframes.

The record

CVE
CVE-2026-88058
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Angular
Product
Angular
Classifications
CWE-79, CWE-116, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record 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=<= 19.2.25
  2. Affected versionversion=>= 20.0.0, < 20.3.30
  3. Affected versionversion=>= 21.0.0, < 21.2.22
  4. Affected versionversion=>= 22.0.0, < 22.1.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Angular · Angularversion=<= 19.2.25; version=>= 20.0.0, < 20.3.30; version=>= 21.0.0, < 21.2.22; version=>= 22.0.0, < 22.1.4

Published CVSS scores

8.6GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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')
CWE-116Improper Encoding or Escaping of Output
T1059.007JavaScript/JScript

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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