CVE-2026-55773Network attack vector

Authorization bypass via unescaped Cedar expression serialization

Published Jul 13, 2026 · Updated Jul 13, 2026

Code injection in affected CedarJava releases allows attackers to alter authorization logic through crafted values passed to toCedarExpr(). The Value-type method serializes quotation marks and backslashes into Cedar source without escaping them, allowing injected operators to change a generated policy. The flaw is reachable only when an integrating application builds policy text at runtime with toCedarExpr() on user-controlled values; a successful injection can make a permit unconditional or suppress a forbid.

CVSS severity8.8
High
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in affected CedarJava releases allows attackers to alter authorization logic through crafted values passed to toCedarExpr(). The Value-type method serializes quotation marks and backslashes into Cedar source without escaping them, allowing injected operators to change a generated policy. The flaw is reachable only when an integrating application builds policy text at runtime with toCedarExpr() on user-controlled values; a successful injection can make a permit unconditional or suppress a forbid.

The record

CVE
CVE-2026-55773
Published
Jul 13, 2026
Updated
Jul 13, 2026
Vendor
Cedar Policy
Product
CedarJava
Classifications
CWE-94
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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.

  1. Affected versionversion=< 2.3.6
  2. Affected versionversion=>= 3.1.2, < 3.4.1
  3. Affected versionversion=>= 4.0.0, < 4.9.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cedar Policy · CedarJavaversion=< 2.3.6; version=>= 3.1.2, < 3.4.1; version=>= 4.0.0, < 4.9.0

Published CVSS scores

8.8GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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