CVE-2026-91159

highPriorität · verfolgen · 10EPSS 0.004 · 36. PerzentilExploit · PoCUS
grimoire priorityP1 · Urgent
Exploitable?
Public exploit
1 exploit · PoC
Likely / severe?
0.42% (36th) EPSS
CVSS 7.7 · high
Is it mine?
4 products
Prüfe deine Angriffsfläche
Who says so?
1 sources
osv

EPSS · bewertet 2026-10-28

Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, oEmbed processing treated an entire attacker-controlled HTML fragment as trusted when the fragment contained an iframe whose source matched the configured allowlist. A user with posting permission who controlled a public webpage and its oEmbed response could combine an allowlisted iframe with unrelated sibling HTML or CSS, causing stored visual overlays or other styled content to appear in post content and enabling misleading or fraudulent user interfaces. Exploitation requires a posting account, control of the fetched webpage and oEmbed response, and an allowlisted iframe source. The issue affects content integrity but does not expose restricted data, disrupt availability, or require interaction with Discourse Content Security Policy. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.

01

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

7.7
010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen

v3.17.7highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:Nsecondary · security-advisories@github.comAusnutzbarkeit 3.1 · Auswirkung 4
v3.17.3highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N/E:Psecondary · CVSS-BT (t0sche)
02

SSVC

Eine Handlungsentscheidung — aus Ausnutzung und Auswirkung.

Trackcoordinatorcisa_ssvcUS
03

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-79US
04

Exploits (1)

Öffentlicher Proof-of-Concept- und Exploit-Code.

05

betroffene Produkte (4)

Betroffene Produkte und Versionsbereiche.

06

Advisories (1)

Hersteller- und Ökosystem-Meldungen dazu.

  • BIT-discourse-2026-91159Discourse: Stored oEmbed HTML injection via allowed iframe2026-10-21vendor · osvUS

    Discourse is an open-source discussion platform. Prior to 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9, oEmbed processing treated an entire attacker-controlled HTML fragment as trusted when the fragment contained an iframe whose source matched the configured allowlist. A user with posting permission who controlled a public webpage and its oEmbed response could combine an allowlisted iframe with unrelated sibling HTML or CSS, causing stored visual overlays or other styled content to appear in post content and enabling misleading or fraudulent user interfaces. Exploitation requires a posting account, control of the fetched webpage and oEmbed response, and an allowlisted iframe source. The issue affects content integrity but does not expose restricted data, disrupt availability, or require interaction with Discourse Content Security Policy. This issue is fixed in versions 2026.9.0, 2026.8.1, 2026.7.3, and 2026.1.9.

07

auch bekannt als (1)

Weitere Namen und Kennungen dieser Entität.

08

quellen

Welche Quellen diesen Datensatz belegen und wann.

osvNVDCVE.orgMITRE
veröffentlicht 2026-10-14geändert 2026-10-20
09

Referenzen (5) nvd

Externe Belege — Patches, Meldungen, Analysen.

scry

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