CVE-2026-57857

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2026-07-18. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: None knownExposed: 0

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

The Flow Payment plugin for WordPress (flow.cl) version 3.0.8 is vulnerable to reflected cross-site scripting on the WooCommerce checkout page. When the plugin handles an order cancellation, the error_message GET parameter is passed directly to wc_add_notice() in flowpayment-fl.php (lines 57-58) without input sanitization (for example sanitize_text_field()) or output escaping (for example esc_html()) before being rendered in the checkout notice HTML. An unauthenticated attacker can craft a URL containing a JavaScript payload in the error_message parameter (for example /checkout/?add-to-cart={product-id}&cancel_order=true&error_message={payload}); when a victim with an active WooCommerce checkout session follows the link, the payload executes in the victim's browser in the origin of the WordPress site.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
19(Track)
EG Risk 19/100SSVC: 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
Severity43% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

July 18, 2026

Last Modified

July 23, 2026

Advisory Details (2)

Auto-updated Jul 18, 2026
No patch confirmed yet.
generic

Flow Payment Plugin for WordPress Reflected Cross-Site Scripting via error_message Parameter | Advisories | VulnCheck

https://www.vulncheck.com/advisories/flow-payment-plugin-for-wordpress-reflected-cross-site-scripting-via-error-message-parameter
generic

Flow

https://www.flow.cl/

Vendor Advisories for CVE-2026-57857(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 16× in last 7d / 83× 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 122 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-57857?
CVE-2026-57857 is a medium vulnerability published on July 18, 2026. The Flow Payment plugin for WordPress (flow.cl) version 3.0.8 is vulnerable to reflected cross-site scripting on the WooCommerce checkout page. When the plugin handles an order cancellation, the errormessage GET parameter is passed directly to wcaddnotice() in flowpayment-fl.php (lines 57-58)…
When was CVE-2026-57857 disclosed?
CVE-2026-57857 was first published in the National Vulnerability Database on July 18, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-57857 actively exploited?
CVE-2026-57857 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 73.8% of all scored CVEs.
What is the CVSS score of CVE-2026-57857?
CVE-2026-57857 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-57857?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-57857, 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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