CVE-2026-25741
highpriority · track · 0OT risk · elevatedEPSS 0.003 · 24 %ileEUEPSS · scored 2026-10-28
Zulip is an open-source team collaboration tool. Prior to commit bf28c82dc9b1f630fa8e9106358771b20a0040f7, the API endpoint for creating a card update session during an upgrade flow was accessible to users with only organization member privileges. When the associated Stripe Checkout session is completed, the Stripe webhook updates the organization’s default payment method. Because no billing-specific authorization check is enforced, a regular (non-billing) member can change the organization’s payment method. This vulnerability affected the Zulip Cloud payment processing system, and has been patched as of commit bf28c82dc9b1f630fa8e9106358771b20a0040f7. Self-hosted deploys are no longer affected and no patch or upgrade is required for them.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.5–7.1
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (1)
Products and version ranges known to be affected.
also known as (2)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (7)
External citations — patches, advisories, analysis.
- https://github.com/zulip/zulip/commit/bf28c82dc9b1f630fa8e9106358771b20a0040f7cnnvd
- https://github.com/zulip/zulip/security/advisories/GHSA-vhhx-84f7-rc8jcnnvd
- https://zulip.com/apps/Patchcnnvd
- https://github.com/zulip/zulip/commit/bf28c82dc9b1f630fa8e9106358771b20a0040f7enisa_euvd
- https://github.com/zulip/zulip/security/advisories/GHSA-vhhx-84f7-rc8jenisa_euvd
- https://github.com/zulip/zulip/commit/bf28c82dc9b1f630fa8e9106358771b20a0040f7nvd
- https://github.com/zulip/zulip/security/advisories/GHSA-vhhx-84f7-rc8jnvd
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