CVE-2026-13163

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 59% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Open redirect vulnerability (CWE-601) in the _safe_redirect function of the click-tracking endpoint (/c//) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter, because the URL scheme is validated (blocking javascript: and data:) but the destination host is not restricted to an allowlist, and a signing.BadSignature exception is silently caught so a valid signed token is not required.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
42%
KEV
Not listed

Published

June 24, 2026

Last Modified

June 25, 2026

Advisory Details (1)

Auto-updated Jun 25, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
github_commit

commit 99eb6d458613 (Maalfer/mailerup)

Fix landed in Maalfer/mailerup commit 99eb6d458613 — awaiting tagged release

https://github.com/Maalfer/mailerup/commit/99eb6d4586134bf3f4422093fbf47d6794ef0ee5

Vendor Advisories for CVE-2026-13163(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 6× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 159 total refreshes for this CVE.

  1. 2026-09-11 14:52 UTCEPSS rescore
  2. 2026-09-11 09:36 UTCEPSS rescore
  3. 2026-09-10 09:34 UTCEPSS rescore
  4. 2026-09-08 22:00 UTCEPSS rescore
  5. 2026-09-07 16:01 UTCEPSS rescore
  6. 2026-09-06 13:47 UTCEPSS rescore
  7. 2026-09-04 05:06 UTCEPSS rescore
  8. 2026-09-02 14:11 UTCEPSS rescore
  9. 2026-09-01 13:53 UTCEPSS rescore
  10. 2026-09-01 04:39 UTCEPSS rescore
  11. 2026-08-30 20:21 UTCEG score recompute
  12. 2026-08-30 20:21 UTCGHSA enrichment
  13. 2026-08-30 19:17 UTCEPSS rescore
  14. 2026-08-30 01:21 UTCEPSS rescore
  15. 2026-08-28 21:40 UTCEPSS rescore
  16. 2026-08-28 04:51 UTCEG score recompute
  17. 2026-08-28 04:51 UTCGHSA enrichment
  18. 2026-08-27 14:24 UTCEPSS rescore
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-24 13:48 UTCEG score recompute
  21. 2026-08-24 13:47 UTCGHSA enrichment
  22. 2026-08-23 12:37 UTCEG score recompute
  23. 2026-08-23 12:37 UTCGHSA enrichment
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-22 13:17 UTCEG score recompute
Show 75 more
  1. 2026-08-22 13:17 UTCGHSA enrichment
  2. 2026-08-21 23:48 UTCEPSS rescore
  3. 2026-08-21 07:19 UTCEG score recompute
  4. 2026-08-21 07:19 UTCGHSA enrichment
  5. 2026-08-20 22:55 UTCEPSS rescore
  6. 2026-08-20 07:36 UTCEG score recompute
  7. 2026-08-20 07:36 UTCGHSA enrichment
  8. 2026-08-19 17:03 UTCEPSS rescore
  9. 2026-08-19 02:20 UTCEG score recompute
  10. 2026-08-19 02:20 UTCGHSA enrichment
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-16 18:31 UTCEG score recompute
  13. 2026-08-16 18:31 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 18:17 UTCEG score recompute
  17. 2026-08-15 18:17 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 18:57 UTCEG score recompute
  20. 2026-08-14 18:57 UTCGHSA enrichment
  21. 2026-08-13 22:00 UTCEPSS rescore
  22. 2026-08-13 19:36 UTCGHSA enrichment
  23. 2026-08-12 20:16 UTCEG score recompute
  24. 2026-08-12 20:16 UTCGHSA enrichment
  25. 2026-08-12 13:50 UTCEPSS rescore
  26. 2026-08-11 20:56 UTCEG score recompute
  27. 2026-08-11 20:56 UTCGHSA enrichment
  28. 2026-08-11 13:42 UTCEPSS rescore
  29. 2026-08-10 23:59 UTCEPSS rescore
  30. 2026-08-10 21:36 UTCGHSA enrichment
  31. 2026-08-09 22:16 UTCEG score recompute
  32. 2026-08-09 22:16 UTCGHSA enrichment
  33. 2026-08-09 13:46 UTCEPSS rescore
  34. 2026-08-08 22:57 UTCEG score recompute
  35. 2026-08-08 22:57 UTCGHSA enrichment
  36. 2026-08-08 16:37 UTCEPSS rescore
  37. 2026-08-07 23:37 UTCEG score recompute
  38. 2026-08-07 23:37 UTCGHSA enrichment
  39. 2026-08-07 00:18 UTCEG score recompute
  40. 2026-08-07 00:18 UTCGHSA enrichment
  41. 2026-08-06 13:46 UTCEPSS rescore
  42. 2026-08-06 00:56 UTCEG score recompute
  43. 2026-08-06 00:56 UTCGHSA enrichment
  44. 2026-08-05 19:17 UTCEPSS rescore
  45. 2026-08-05 01:37 UTCEG score recompute
  46. 2026-08-05 01:37 UTCGHSA enrichment
  47. 2026-08-04 15:09 UTCEPSS rescore
  48. 2026-08-04 10:38 UTCEPSS rescore
  49. 2026-08-04 01:54 UTCEG score recompute
  50. 2026-08-04 01:54 UTCGHSA enrichment
  51. 2026-08-03 10:35 UTCEPSS rescore
  52. 2026-08-03 02:34 UTCGHSA enrichment
  53. 2026-08-02 03:14 UTCEG score recompute
  54. 2026-08-02 03:14 UTCGHSA enrichment
  55. 2026-08-02 02:26 UTCEPSS rescore
  56. 2026-08-01 04:15 UTCEPSS rescore
  57. 2026-08-01 03:53 UTCGHSA enrichment
  58. 2026-07-31 03:34 UTCEG score recompute
  59. 2026-07-31 03:34 UTCGHSA enrichment
  60. 2026-07-30 16:27 UTCEPSS rescore
  61. 2026-07-30 02:25 UTCEG score recompute
  62. 2026-07-30 02:24 UTCGHSA enrichment
  63. 2026-07-30 01:30 UTCEPSS rescore
  64. 2026-07-29 01:04 UTCEG score recompute
  65. 2026-07-29 01:04 UTCGHSA enrichment
  66. 2026-07-28 15:36 UTCEPSS rescore
  67. 2026-07-27 17:42 UTCEG score recompute
  68. 2026-07-27 17:42 UTCGHSA enrichment
  69. 2026-07-27 14:13 UTCEPSS rescore
  70. 2026-07-26 15:44 UTCEG score recompute
  71. 2026-07-26 15:44 UTCGHSA enrichment
  72. 2026-07-26 14:54 UTCEPSS rescore
  73. 2026-07-26 14:54 UTCEPSS rescore
  74. 2026-07-25 14:17 UTCEPSS rescore
  75. 2026-07-24 14:17 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-13163?
CVE-2026-13163 is a medium vulnerability published on June 24, 2026. Open redirect vulnerability (CWE-601) in the saferedirect function of the click-tracking endpoint (/c/<token>/) in Mailerup <1.0.0 on all platforms allows remote unauthenticated attackers to redirect victims to arbitrary external sites and conduct phishing attacks via a crafted u query parameter,…
When was CVE-2026-13163 disclosed?
CVE-2026-13163 was first published in the National Vulnerability Database on June 24, 2026, with the most recent update on June 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13163 actively exploited?
CVE-2026-13163 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 58.1% of all scored CVEs.
What is the CVSS score of CVE-2026-13163?
CVE-2026-13163 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-13163?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13163, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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