VulnSocial

CVE-2026-34840Patch(hackerbay / oneuptime)

LOWCVSS 8.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch hackerbay oneuptime systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts) has decoupled signature verification and identity extraction. isSignatureValid() verifies the first <Signature> element in the XML DOM using xml-crypto, while getEmail() always reads from assertion[0] via xml2js. An attacker can prepend an unsigned assertion containing an arbitrary identity before a legitimately signed assertion, resulting in authentication bypass. This issue has been patched in version 10.0.42.

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0.5/ 10 priority

Sources & remediation

Patch / fix
Exploit / PoC references
Other references
Weakness type (CWE)
CWE-347

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • oneuptime

Threat summary

  • Patch or workaround signal is available
  • 3 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 2 signals
  • Technical details provided in 3 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 2 mentions (2026-04-03); latest day: 1
  • 3 total mentions across 2 days

Affected systems

Vendors
hackerbay
Products
oneuptime

Deep dive

Activity timeline3 mentions / 2d
01122Mentions · 2026-04-03: 2Mentions · 2026-04-14: 1Patch / Workaround · 2026-04-03: 1Patch / Workaround · 2026-04-14: 1Technical Details · 2026-04-03: 2Technical Details · 2026-04-14: 104-0304-14
Signal classification2 categories
Patch
266.7%
Disclosure
133.3%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-04-032
Disclosure1Patch1
2026-04-141
Patch1
Full discourse3 posts
  • Giuseppe Paternicola@giuseppe_1337
    Patch

    🚨 HIGH: CVE-2026-34840 (CVSS 8.1) OneUptime SAML SSO auth bypass via XML signature validation flaw. Attackers can prepend unsigned assertions to bypass authentication. Patched in v10.0.42 - update immediately. #CVE #Vulnerability #PatchNow https://t.co/mZKs8HUuOG

    Post summary

    The tweet reports a high‑severity XML signature validation flaw in OneUptime SAML SSO that enables authentication bypass, and it stresses that the issue is fixed in v10.0.42, advising a prompt update.

    0000043
    25 followersView on X
  • CVE@CVEnew
    Patch

    CVE-2026-34840 OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts… https://www.cve.org/CVERecord?id=CVE-2026-34840

    Post summary

    The CVE-2026-34840 refers to a SAML SSO flaw in OneUptime, fixed in version 10.0.42, with no evidence of exploitation or PoC in the provided text.

    00000166
    56.9K followersView on X
  • The Hacker Wire@TheHackerWire
    Disclosure

    🟠 CVE-2026-34840 - High OneUptime is an open-source monitoring and observability platform. Prior to version 10.0.42, OneUptime's SAML SSO implementation (App/FeatureSet/Identity/Utils/SSO.ts) has decoupled signature... https://www.thehackerwire.com/vulnerability/CVE-2026-34840/ https://t.co/2jolpCIEg0

    Post summary

    The HackerWire post announces CVE‑2026‑34840 as a high‑severity flaw in OneUptime’s SAML SSO module involving a decoupled signature, but offers no PoC, exploit code, patch guidance, or evidence of active exploitation.

    0000051
    160 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Apphackerbayoneuptime---

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