CVE-2023-26047
mediumpriority · track · 24EPSS 0.005 · 44 %ileEUUSEPSS · scored 2026-10-27
teler-waf is a Go HTTP middleware that provides teler IDS functionality to protect against web-based attacks. In teler-waf prior to version v0.2.0 is vulnerable to a bypass attack when a specific case-sensitive hex entities payload with special characters such as CR/LF and horizontal tab is used. This vulnerability allows an attacker to execute arbitrary JavaScript code on the victim's browser and compromise the security of the web application. An attacker can exploit this vulnerability to bypass common web attack threat rules in teler-waf and launch cross-site scripting (XSS) attacks. The attacker can execute arbitrary JavaScript code on the victim's browser and steal sensitive information, such as login credentials and session tokens, or take control of the victim's browser and perform malicious actions. This issue has been patched in version 0.2.0.
cvss
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base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-p2pf-g8cq-3gq5teler-waf contains detection rule bypass via Entities payload2023-03-01ghsa · osvUS
### Description teler-waf is a Go HTTP middleware that provides teler IDS functionality to protect against web-based attacks. teler-waf prior to version v0.2.0 is vulnerable to a bypass attack when a specific case-sensitive hex entities payload with special characters such as CR/LF and horizontal tab is used. This vulnerability allows an attacker to execute arbitrary JavaScript code on the victim's browser and compromise the security of the web application. ### Impact An attacker can exploit this vulnerability to bypass common web attack threat rules in teler-waf and launch cross-site scripting (XSS) attacks. The attacker can execute arbitrary JavaScript code on the victim's browser and steal sensitive information, such as login credentials and session tokens, or take control of the victim's browser and perform malicious actions. ### Patches Version [v0.2.0](https://github.com/kitabisa/teler-waf/releases/tag/v0.2.0) includes a patch for this vulnerability. ### Workarounds We advised updating their installations to version v0.2.0 and frontwards immediately.
- GO-2023-1600Arbitrary code execution in github.com/kitabisa/teler-waf2023-03-02vendor · osvUS
Improper handling of payload with special characters, such as CR/LF and horizontal tab, can lead to execution of arbitrary JavaScript code.
also known as (5)
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sources
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references (10)
External citations — patches, advisories, analysis.
- https://cxsecurity.com/cveshow/CVE-2023-26047/cnnvd
- https://github.com/dwisiswant0/cwa-filter-rules/commit/d818d1645832d1a02cd210c7680e692d2bf4313bcnnvd
- https://github.com/kitabisa/teler-waf/releases/tag/v0.2.0cnnvd
- https://github.com/kitabisa/teler-waf/security/advisories/GHSA-p2pf-g8cq-3gq5cnnvd
- https://github.com/dwisiswant0/cwa-filter-rules/commit/d818d1645832d1a02cd210c7680e692d2bf4313benisa_euvd
- https://github.com/kitabisa/teler-waf/releases/tag/v0.2.0enisa_euvd
- https://github.com/kitabisa/teler-waf/security/advisories/GHSA-p2pf-g8cq-3gq5enisa_euvd
- https://github.com/dwisiswant0/cwa-filter-rules/commit/d818d1645832d1a02cd210c7680e692d2bf4313bPatchnvd
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