CVE-2026-55549Medium· 6.5▾ TwilightPoC availableYamcs is a mission control framework. Prior to 5.9.4, Yamcs reflects an attacker-controlled redirect_uri parameter from GET /auth/authorize into yamcs-core/src/main/resources/auth/templates/authorize.html without adequate HTML escaping b…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 35.8 · likelihood 0.2 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Exploit-prediction probability, daily snapshots since Aug 29.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.4%
Last analysed / modified upstream
0.4% → 0.9%
Nuclei ×1
Yamcs is a mission control framework. Prior to 5.9.4, Yamcs reflects an attacker-controlled redirect_uri parameter from GET /auth/authorize into yamcs-core/src/main/resources/auth/templates/authorize.html without adequate HTML escaping by yamcs-core/src/main/java/org/yamcs/http/auth/AuthHandler.java and yamcs-core/src/main/java/org/yamcs/http/HandlerContext.java. A crafted authorization URL can execute JavaScript when opened by a Yamcs user. The script can access browser-held authentication material and transmit it to an attacker, enabling account compromise. This issue is fixed in version 5.9.4.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
org.yamcs:yamcs-core < 5.9.4Patched in:
org.yamcs:yamcs-core 5.9.4Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
CVE-2026-55566Medium· 4.3Yamcs is a mission control framework
CVE-2026-55511Critical· 9.1Yamcs is a mission control framework
CVE-2026-55559Critical· 9.8Yamcs is a mission control framework
CVE-2026-55565Critical· 9.9Yamcs is a mission control framework
CVE-2026-55521High· 8.8Yamcs is a mission control framework
CVE-2026-55545Medium· 6.5Yamcs is a mission control framework