CVE-2026-80350Public exploitNetwork attack vectorHinoki check available

Authenticated SSRF via IPv4-mapped IPv6 webhook URL

Published Aug 26, 2026 · Updated Aug 26, 2026

SSRF in OneUptime before 12.0.7 allows remote authenticated users to read internal HTTP responses via a crafted webhook URL. isBlockedHostnameLiteral in Common/Server/Utils/SSRFProtection.ts omits the IPv4-mapped IPv6 range and skips DNS rechecking for address literals. Any project member who can configure webhooks can make the server send GET or POST requests to loopback, private-network, or link-local targets, with responses stored in webhook results.

CVSS severity7.1
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in OneUptime before 12.0.7 allows remote authenticated users to read internal HTTP responses via a crafted webhook URL. isBlockedHostnameLiteral in Common/Server/Utils/SSRFProtection.ts omits the IPv4-mapped IPv6 range and skips DNS rechecking for address literals. Any project member who can configure webhooks can make the server send GET or POST requests to loopback, private-network, or link-local targets, with responses stored in webhook results.

The record

CVE
CVE-2026-80350
Published
Aug 26, 2026
Updated
Aug 26, 2026
Vendor
OneUptime
Product
OneUptime
Classifications
CWE-918, T1090
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 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=0 <12.0.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OneUptime · OneUptimeversion=0 <12.0.7

Published CVSS scores

8.5OneUptimeCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
7.1VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
7.1VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
T1090Proxy

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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