Description
Spring WebFlux applications may be vulnerable to a security bypass when using the Kotlin Router DSL.
Affected versions:
Spring Framework 5.3.0 through 5.3.48.
Basic information
- Type
- unreviewed
- Severity
- medium
- Advisory on GitHub
- Open advisory ↗
- Repository advisory
- —
- Source code
- Not specified
- Published (advisory)
- 2026-06-09 06:31:58 UTC
- Updated
- 2026-06-09 06:32:06 UTC
- NVD published
- 2026-06-09
EPSS Score
| Score |
Percentile |
|
0.03%
|
8.00% |
CVSS Scores
| Base score |
Version |
Severity |
Vector |
|
4.8
|
3.1 |
—
|
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Click to expand
- Attack vector (AV:N)
- Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
- Attack complexity (AC:H)
- Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
- Privileges required (PR:N)
- No account or special rights needed—anonymous or random user is enough.
- User interaction (UI:N)
- Nobody has to click “OK” or open a trap file; it can work without a victim helping.
- Scope (S:U)
- Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
- Confidentiality (C:L)
- Some sensitive info could get out, but not a total data dump.
- Integrity (I:L)
- Attackers could change some data, but it’s limited—not everything goes.
- Availability (A:N)
- Service keeps running; no real outage angle.
|
CWEs
| CWE id |
Name |
|
CWE-284
|
Improper Access Control |
cvelogic
Threat Intelligence