CVE-2025-34412Network attack vector

Browser isolation bypass via insecure headers and cookies

Published Dec 15, 2025 · Updated Dec 15, 2025

Protection mechanism failures in EQS Group Convercent through 2025-12-15 allow remote attackers to undermine browser and session controls. The hosted application omits six HTTP isolation headers, applies incomplete framing restrictions, duplicates ASP.NET_SessionId cookies, and sets inconsistent Secure and SameSite attributes. The exposure is remotely reachable under default SaaS settings and is bounded to weakened client-side isolation and session integrity; the CNA later rejected the CVE because it covered a SaaS product requiring no user action.

CVSS severity9.3
Critical
EPSS probabilityUnavailable
No score available in this record
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Protection mechanism failures in EQS Group Convercent through 2025-12-15 allow remote attackers to undermine browser and session controls. The hosted application omits six HTTP isolation headers, applies incomplete framing restrictions, duplicates ASP.NET_SessionId cookies, and sets inconsistent Secure and SameSite attributes. The exposure is remotely reachable under default SaaS settings and is bounded to weakened client-side isolation and session integrity; the CNA later rejected the CVE because it covered a SaaS product requiring no user action.

The record

CVE
CVE-2025-34412
Published
Dec 15, 2025
Updated
Dec 15, 2025
Vendor
EQS Group GmbH
Product
Convercent
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 15, 2025Record 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 <=2025-12-15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EQS Group GmbH · Convercentversion=0 <=2025-12-15

Published CVSS scores

9.3Full Disclosure advisoryCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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