CVE-2026-33534

MEDIUMNVD 4.34.3
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This medium-severity CVE scores 4.3 under NVD CVSS v3. EPSS exploit probability: 2.0% (80th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-22079 (ENISA EUVD)Source: ENISA EUVD

4.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 2.0%CVSS: 4.3Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authenticated Server-Side Request Forgery (SSRF) vulnerability that allows bypassing the internal-host validation logic by using alternative IPv4 representations such as octal notation (e.g., 0177.0.0.1 instead of 127.0.0.1). This is caused by HostCheck::isNotInternalHost() function relying on PHP's filter_var(..., FILTER_VALIDATE_IP), which does not recognize alternative IP formats, causing the validation to fall through to a DNS lookup that returns no records and incorrectly treats the host as safe, however the cURL subsequently normalizes the address and connects to the loopback destination. Through the confirmed /api/v1/Attachment/fromImageUrl endpoint, an authenticated user can force the server to make requests to loopback-only services and store the fetched response as an attachment. This vulnerability is distinct from CVE-2023-46736 (which involved redirect-based SSRF) and may allow access to internal resources reachable from the application runtime. This issue has been fixed in version 9.3.4.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity43% × 45%
Impact severity (EG Severity): CVSS 4.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.0%
EPSS %ILE
80th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (4.3): severity, escalated by confirmed exploitation. This CVE's 4.3 is its impact severity (EG Severity), not escalated.

EG Severity
4.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
2.0% within 30 daysSource: FIRST EPSS. FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

April 13, 2026

Last Modified

April 22, 2026

Advisory Details (2)

Auto-updated Aug 5, 2026
Patch available. Sources: github_release, github.
GitHub advisoryMentions a patch (unverified)

Authenticated SSRF via internal-host validation bypass using alternative IPv4 notation · Advisory · espocrm/espocrm · GitHub

https://github.com/espocrm/espocrm/security/advisories/GHSA-h7gx-8gwv-7g73
GitHub release Patch Available

Release 9.3.4 (espocrm/espocrm)

Patch available: espocrm/espocrm 9.3.4

https://github.com/espocrm/espocrm/releases/tag/9.3.4

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 36× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 96 of 202 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 4 repeat rows among the latest 100 are merged into the row they repeat. The 106 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  3. 2026-10-27 16:31 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  4. 2026-10-26 16:31 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  5. 2026-10-25 16:32 UTCEPSS rescoreEPSS 2.0% · 80th percentile
  6. 2026-10-25 14:34 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  8. 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  9. 2026-10-23 03:30 UTCEG score recompute
  10. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  11. 2026-10-21 16:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  12. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  13. 2026-10-19 16:31 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  14. 2026-10-18 16:31 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  15. 2026-10-18 03:46 UTCEG score recompute
  16. 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  17. 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  19. 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  20. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  21. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  22. 2026-10-12 16:13 UTCEG score recompute
  23. 2026-10-11 19:55 UTCEG score recompute
  24. 2026-10-11 17:08 UTCEG score recompute
  25. 2026-10-11 14:36 UTCEG score recompute
Show 71 more
  1. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  2. 2026-10-10 20:23 UTCOSV refresh
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  4. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  5. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  6. 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  7. 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  8. 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  9. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  10. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  11. 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  12. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  13. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  14. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  15. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  16. 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.7% · 76th percentile
  17. 2026-09-21 07:49 UTCOSV refresh
  18. 2026-09-18 19:28 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  19. 2026-09-17 19:30 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  20. 2026-09-16 14:08 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  21. 2026-09-16 05:15 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  22. 2026-09-15 03:11 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  23. 2026-09-12 15:01 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  24. 2026-09-11 14:53 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  25. 2026-09-11 09:37 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  26. 2026-09-10 09:34 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  27. 2026-09-08 22:00 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  28. 2026-09-07 16:01 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  29. 2026-09-06 13:47 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  30. 2026-09-04 05:06 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  31. 2026-09-02 14:11 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  32. 2026-09-02 05:28 UTCOSV refresh
  33. 2026-09-01 13:53 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  34. 2026-09-01 04:39 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  35. 2026-08-30 19:17 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  36. 2026-08-30 01:22 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  37. 2026-08-28 21:41 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  38. 2026-08-27 14:25 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  39. 2026-08-26 14:46 UTCEPSS rescoreEPSS 2.0% · 79th percentile
  40. 2026-08-25 13:49 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  41. 2026-08-24 14:17 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  42. 2026-08-23 00:19 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  43. 2026-08-21 23:49 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  44. 2026-08-20 22:55 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  45. 2026-08-19 17:03 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  46. 2026-08-18 13:48 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  47. 2026-08-17 13:47 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  48. 2026-08-16 14:56 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  49. 2026-08-16 06:53 UTCEG score recompute
  50. 2026-08-16 02:14 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  51. 2026-08-15 01:30 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  52. 2026-08-14 04:55 UTCEG score recompute
  53. 2026-08-13 22:00 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  54. 2026-08-12 19:09 UTCEG score recompute
  55. 2026-08-12 13:50 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  56. 2026-08-11 04:08 UTCEG score recompute
  57. 2026-08-11 00:00 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  58. 2026-08-10 04:13 UTCEG score recompute
  59. 2026-08-09 13:46 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  60. 2026-08-09 04:17 UTCEG score recompute
  61. 2026-08-08 16:37 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  62. 2026-08-07 13:56 UTCEG score recompute
  63. 2026-08-06 13:46 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  64. 2026-08-05 23:34 UTCEG score recompute
  65. 2026-08-05 19:17 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  66. 2026-08-04 15:10 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  67. 2026-08-04 10:38 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  68. 2026-08-03 21:48 UTCEG score recompute
  69. 2026-08-03 10:36 UTCEPSS rescoreEPSS 2.0% · 78th percentile
  70. 2026-08-02 13:32 UTCEG score recompute
  71. 2026-08-02 02:27 UTCEPSS rescoreEPSS 2.0% · 78th percentile

Publicly available exploits

(2 references)

Public exploit code is referenced for this CVE (1 Exploit-DB entry), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.

  • Exploit-DBEDB-52583
    Published May 27, 2026

    EspoCRM 9.3.3 - SSRF

    Open source ↗
  • Nucleihttp/cves/2026/CVE-2026-33534.yaml
    Published May 12, 2026

    EspoCRM <= 9.3.3 - Server-Side Request Forgery

    Open source ↗

Frequently asked(5)

What is CVE-2026-33534?
CVE-2026-33534 is a medium-severity vulnerability; its CVE record was published on April 13, 2026. EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have an authenticated Server-Side Request Forgery (SSRF) vulnerability that allows bypassing the internal-host validation logic by using alternative IPv4 representations such as octal notation (e.g.,…
When was the CVE record for CVE-2026-33534 published?
The CVE record for CVE-2026-33534 was published on April 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of April 22, 2026; the record at its source may have been updated since.
Is CVE-2026-33534 actively exploited?
CVE-2026-33534 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.0% probability of exploitation in the next 30 days (80th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33534?
CVE-2026-33534 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-33534?
A fix for CVE-2026-33534 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

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