{"cve":"CVE-2021-26077","nvd":{"published":"2021-05-10T00:15:07.543","modified":"2026-06-17T03:42:48.703","status":"Modified","description":"Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-287"],"references":["https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147","https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072","https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147"],"products":["atlassian:connect_spring_boot"],"source":"nvd","synced_at":"2026-10-19T21:18:09.669877188+00:00"},"epss":{"cve":"CVE-2021-26077","score":0.00951,"percentile":0.61304,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-2x7v-w2mv-f3rx","url":"https://osv.dev/vulnerability/GHSA-2x7v-w2mv-f3rx","summary":"Improper Authentication in Atlassian Connect Spring Boot","modified":"2023-11-08T04:05:20.105715Z","packages":[{"ecosystem":"Maven","name":"com.atlassian.connect:atlassian-connect-spring-boot","purl":"pkg:maven/com.atlassian.connect/atlassian-connect-spring-boot","ranges":[">=1.1.0 <2.1.3"],"fixed":["2.1.3"]},{"ecosystem":"Maven","name":"com.atlassian.connect:atlassian-connect-spring-boot","purl":"pkg:maven/com.atlassian.connect/atlassian-connect-spring-boot","ranges":[">=2.1.4 <2.1.5"],"fixed":["2.1.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}