Open redirect and request steering via encoded prefix
Published May 13, 2026 · Updated May 13, 2026
Path traversal in Angular SSR before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7 allows remote attackers to steer requests or redirects. X-Forwarded-Prefix validation fails to account for percent-encoded dot segments, so later decoding turns %2e%2e into traversal that influences redirect and request paths. Exploitation requires trusted, unsanitized proxy headers and an application that performs internal redirects or relative server-side HttpClient requests.
Summary
What happened
Path traversal in Angular SSR before 19.2.25, 20.3.25, 21.2.9, and 22.0.0-next.7 allows remote attackers to steer requests or redirects. X-Forwarded-Prefix validation fails to account for percent-encoded dot segments, so later decoding turns %2e%2e into traversal that influences redirect and request paths. Exploitation requires trusted, unsanitized proxy headers and an application that performs internal redirects or relative server-side HttpClient requests.
The record
- CVE
- CVE-2026-44437
- Published
- May 13, 2026
- Updated
- May 13, 2026
- Vendor
- Angular
- Product
- Angular CLI
- Classifications
- CWE-22, CWE-601, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 13, 2026CVE publishedPublication date reported by the CVE source.
- May 13, 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.
- Affected versionversion=>= 19.0.0-next.0, < 19.2.25
- Affected versionversion=>= 20.0.0-next.0, < 20.3.25
- Affected versionversion=>= 21.0.0-next.0, < 21.2.9
- Affected versionversion=>= 22.0.0-next.0, < 22.0.0-next.7
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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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