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01 Record

CVE-2026-53427

Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute

LowPUBLISHEDCNA: EEF
CNA base score2.3 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
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02 Description

Cross-site scripting in MDEx via unescaped highlight_lines_class code-fence attribute

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.68% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 52.1% of scored records. A rank, not a probability.
NVD base score
2.3 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Deferred. NVD last modified this record on 2026-10-25.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-29 18:50Z4 MO AGO
Last updated
2026-06-30 04:37Z4 MO AGO
Reserved
2026-06-09
Assigning CNA
EEF
Record state
PUBLISHED
Severity
Low (CVSS 2.3)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weaknesses
  • CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base
Data version
5.2
Document digest
e46692adaf1ce030344e447e47e087044beffe81588ee62a9fec1ee914bc5fd8

05 Affected products

VendorProductVersionsPlatforms
leandrocpmdex0.11.3 to < 0.12.3, 0d7ffc84ea742e1daf666426814e5bb6d0499433 to < 6ed94d905f97af188323f042698ae841c02293b4—
leandrocpmdex_native0.1.0 to < 0.2.3, 956528c5e31746253347029e810a969ab916fd27 to < 798a363b4339f6f7162ec8437c4c9f9b5ae6fbf3—

06 References